patch 9.0.1770: lines disappear when modifying chars before virt text

Problem:  lines disappear when modifying chars before virt text
Solution: take virtual text property length into account

closes: #12558
closes: #12244

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Ibby <33922797+SleepySwords@users.noreply.github.com>
diff --git a/src/version.c b/src/version.c
index e81dd71..83a0075 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1770,
+/**/
     1769,
 /**/
     1768,